/Engine/Source/Runtime/Engine/Public/Net/NetPacketNotify.h
Init notification with expected initial sequence numbers
void Init ( [SequenceNumberT](API\Runtime\Engine\Net\FNetPacketNotify\SequenceNumberT) InitialInSeq, [SequenceNumberT](API\Runtime\Engine\Net\FNetPacketNotify\SequenceNumberT) InitialOutSeq )